Greybeard

What exact message are you getting? Can you show a photo of the rear camera screen? Are you running out of frame numbers? That would stop the camera from operating. If the camera shows full when the card has just been reformatted then there is something wrong with the card. If you frequently delete images with a computer then it won't free up space until you reformat. How many images have you shot when the camera shows full and do you delete individual images in camera or computer? Another test would be to buy a new card (Sandisk Extreme Pro UHS-I are good and relatively inexpensive) and see if you get the same problem - if you don't then get rid of your current card.

I'd recommend saving the images from the card onto your computer and then reformatting the card in the camera. Have you deleted any of the images (either in the camera or on the computer)?

My camera is running the same firmware and does exactly what you say you want to happen

Set up menus: Screen Set-Up => Image Disp.

Mine has a little play/wobble - but not as much as yours. Does it work OK? Perhaps you could contact Fujifilm support and ask if its something they would expect.

Agree - I also think the problem where the camera focuses on the nearest point rather than the eye of an animal (when using subject detection) hasn't been fixed.

Have you tried using the Xapp on a phone?

Agreed - although in looking for a solution I would go through the functions that could result in movement - especially image #147 - which could be due to electronic shutter but it looks as though the camera would have been rotated while the image was taken

Thats bizarre - its not just RAW though is it - at least one of the jpgs are also showing strange behaviour. You might try turning off IBIS although that is clutching at straws.

Have you managed to put the battery in the wrong way round? If you look in the battery compartment you will see the connections - make sure the connections on the battery are on the same side as the connections on the camera. Otherwise there is either a problem with battery or camera - do you have access to a different battery?

Large Indicator support was added with firmware version 2.0. You can find a new features manual on the Fujifilm firmware history web page: https://fujifilm-x.com/en-gb/support/download/firmware/cameras/x-t20/

Yes - you can see a complete list of changes for each firmware release here: https://fujifilm-x.com/en-gb/support/download/firmware/cameras/x-t2/ (As you can see your camera is still a few releases behind the current version 4.40)

Do you have Shooting Mode selected in the screen custom settings menu? https://fujifilm-dsc.com/en/manual/x-t2/menu_setup/screen_set-up/index.html#disp_custom_setting

No - its not obvious - I think most of us have been confused by this

"I have manually copied a Raw image from the SD card to the computer and X Raw Studio reads it fine." Thats how it works - its not supposed to process image files on the camera card

Version 7.0 installed OK on my camera - perhaps you could try using the Xapp from a phone

You have turned on the Flickerless SS Setting - its designed so that you can reduce flickering from some types of artificial lighting https://fujifilm-dsc.com/en/manual/x-h2s/menu_shooting/shooting_setting/#flickerless_s-s_setting

Is there some dirt or something thats caused the Disp/Backup button to stay pressed in?

Is it the short or long press that is bothering you? I don't think you can do anything about the long press but if you set the second and third actions to "none" then a short press should do nothing. (Admittedly I haven't tested this on the X-T5 but according to the manual it works the same as my X100VI)

When you press the Drive Delete button what happens? If you have images on the card and use playback - does the Drive Delete button work to delete images? If nothing happens when you press Drive Delete in either shooting mode or playback it sounds like there is something wrong with the Drive Delete button. Maybe some dirt stuck around it?

Do you have a Custom Setting Selected? https://fujifilm-dsc.com/en/manual/x-t5/menu_shooting/image_quality_setting/#select_custom_setting If so then you need to edit that custom setting to remove the functions you don't want https://fujifilm-dsc.com/en/manual/x-t5/menu_shooting/image_quality_setting/#edit-save_custom_setting As an alternative you can enable Auto Update Custom Setting and then any changes you make will be remembered when the camera is turned off https://fujifilm-dsc.com/en/manual/x-t5/menu_shooting/image_quality_setting/#auto_update_custom_setting

I believe the only way to do this with the X100S is to switch the autofocus button to MF and use the AFL/AEL button. The X100S doesn't have the option for back button focus in AF mode like more recent X series camera models.

I don't think its possible - you could do the opposite (keep it on) with some tape - but not sure there is a way to keep it off (although like Jerryy says - it would certainly chew through the battery even if you could)

The difference only applies if you have set the camera to display the image after shooting (Screen Setting => Image Disp in the menu) - otherwise they behave the same. With Eye Sensor the image display option is shown in both evf and lcd (in other words you see the image you just shot in either the evf or lcd) - but with Eye Sensor + LCD Display that image is only shown in the lcd not the evf. The advantage of the second option is that you can use the evf and keep shooting without the delay for showing the image you just shot - but take your eye away from the evf and see that image in the lcd.

Are you in Large Indicator Mode in the Screen Set-Up menu?